Air-pump.



D. F. CORNELL.

.un PUMP. n APPLIOLTIOI FILED KAY 25. 1909.

,To all wlw-m 'it 'may conm-rn:

UNITED sTATEs PATENT oFEicE,

D QVID F. CORNELL, 0E ROCHESTER, MINNESOTA, ASSIGNOR, BY MESNE ASSIGNMENTS, OF TWO-THIBDS T0 GEORGE A. POOLE, OF GREENWOOD, WISCONSIN.

lTn-Purina Application ined my 25, isos. serial No. 498,333.

Be it known that I, Davie F. CORNELL, a. citizen of the United States, and residiii at Rochester, in the county of Olmsted au State of Minnesota., have invented certain new and useful Improvements in Air- Pumps, of which the following is a specilisation, such as will enable those skilled in the art to which it appc-rtains to make and use the same.

This invention relates to air pumpsi airA compressors and like devices; and the obv ject thereof is to provide an improved device of this class which is simple in construction and operation and which may be easily mani ulated by hand t'or the pur pose of in ating pneumatic tires, or for compressing air in any suitable receptacle or receiver for any desired purpose, and by means of which any desired pressure of air up to sa. .three hundred pounds may be quickly pr need.

The invention is fully .disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvementare designated by suitable. reference. characters in each of the views, and in which Figure 1 is a sectional side view of my improved air pum Fig. 2 a bottom View of one part of a p unger head which I eniploy, and ;Fig. 3 a similar view of another partei said plunger head. In the practice of my invention, I provide a strong substantial frame comprising a base plate or member a and a top plate or member bz said plates or members being connected oy vertically arranged rodso :o as to form a strong substantial frame.

The bottom plate or member a, in the forni of construction shown, is provided with a depending flange or rim a, and the central portion thereof is thickened and provided with a circular chamber a3 having an inwardly directed top flange a, and placed in the chamber a3 is a packing a5 of rubber or any other suitable material. The central port-ion of the top plate or member b is also thickened and formed therein is a chamber b2 which opens downwardly and around which is an inwardly directed annular flange or rim d3, and placed in the 'chamber b2 is a packing gasket b3 of rubber tapered outwardly and the inner walls of w ich are cylindrical in form.A

Secured between the top and bottom plates or members a, and b is a tubular casing d the top and bottom ends of which enter the chambers b2 and a3 in the to and bottom plates or members and a an( press on the packings b3 and a, and the rot-s c of the` main frame are provided at their upper ends with nuts c2 by which the top and bottom plates or members b and a may be se- A curely drawn together, and. this as will be understood, forms a perfectlj,l air tight joint for the upper and lower ends of the tubular casing (Z.

Passing centrally and downwardly through the top plate or member i5 and packingr is a plunger tube c ot less diameter than the tubular casing a and fitting concentrically therein so as to form an annular space or chamber f between' said tubular casing and said plunger tube, andthe tube e forms a plunger the lower end of which is provided with a head e2 by which it is closed and coinprising a top member g and bottom member h, and the upper end of the tube e is closed by a cap et and provided below said cap. with air ports or passages c4, and passing downwardly and centrally through the cap e3 of the tube e and through said tube and the head e2 of the plunger is a rod provided at its upper cnd'with a handle z2 and nut 3, and at ils lower end with' a nut z, and by means of the rod and the nuts z" and i* the parts e, c2, c and i2 are securely bound together and form a complete plunger, the top portion of which consists of the handle i2.

The top part g of the plunger head c2 is of smaller transverse dimensions than the bottom pai-t 71. of said plunger head and is also of less dimensions than the tube e, and said top part consists of a bottoni portion g2 and a top portion gf between which is placed a iicxible valye disk or gasket. q having a downwardly directed skirt or valve member g5 which presses on the in. er wall of the tube e. I

The top part g of the plungcrhead 0r the bottoni portion g2 thereof, is provided with a central depending boss g in which 1s formed a central conical recess g' in the side walls of which are radial ports or -wit'h a downwartlly directed boss r", and said a pt rt'ectly tightI joint between said tube The bottomv part t of the plunger head e2 t consists of a top portion r" and a bottom portion if, and the said bottom part It of the plunger head e is of less transverse dimensions than the tubular easing d, and placed between the top and bottom portions thereof :t #terrible packing gaslrt '/t pro` vided with an upward!)v direeted skirt or valve member it adapted to bear on the inner walls of the tubular casing d.

The bottom portion /L2 of the bottom part L ot' tite piunger head t:"` is provided eentrally bottom part /tl ot' said plunger head c: is providrv-.t with a large central verti al port. or passage /L' through which the rod i passes, and the boss /r is provided with an internai rabbet groove or reces-s Il, in which i tite nttt i* tits7 and the central port or passage lr' through the bottom g-art lt2 of the plunger head c: is much larger in transverse dimensions than the rod z', and the boss fr is provided with side ports or passages ILT, all as clearl)v shown in liigs. 1 and il..r

llaced on the rod z' above the plunger head ez'is` a nut between which and the plunger head e* or the top part thereof is placed a `packing,r gasket j, and the separate parts of ythe plunger head tj" are not connected in any way except, by the rod i and the nuts z" and j, and the bottom part It ofthe plunger head c", or the top portion thereof is provided with an annular groove l: in which the lower end of the tube e fits. The top of the top portion of the bottom part t of the plunger head is int-losed b) the lower end of the tube c and the walls thereof are tapered or conical, and the tube e in assembling the parts is compressed et. Said conical or tapered walls, and this forms and the bottom part of the plunger head.

In assembling these'lxarts of my improved i pump, the parts of the plunger head are mounted on the rod i in the order .shown in Fig. l lwejinnng with the nut 'l`he rod i is then inserted into the lower t-nd ol thttube e, the top plate or member /1 and the packing if' are then placed on the tube e; or said tube is passed tlteretl'trough, and the tube r; is inserted into the easing' tl, after whit-h the parts a and are connected or the top plate or member tf' is st--ured on tite rods c, and after this operation the cap cz is' placed on the tube l' and the handle i: on tite rod and by meansl ol' the nut ii.'

thc tube a, the plunger lit-ad e thereof and t the rap u and handle I: will be .securely g bound =ogetner and the tie-vict; will be ready for tbe. l

The top part of the tubular easing; rl is provided :it one side with a noz/.le m with which :t flexible ho.-e or similar device may be coiuter'e'l t'or the purple ot' conveying air under pressure to a pneumatic tire to be inflated or to any other receptacle designed to contain air under pressure for any purpose, and this nozzle m communicates wit-h the annular chamberi at m2 and at a predetermined point be ow the top of said chamber. t

The operation mi he ...n o readily understood from the foregoing description when taken in connection with the accompanying drawing and the following` statement thereof. ln the upward movement of the plunger, the air passes downwardly through the tube e and through the plunger head into a chamber in the lower end of thettuhular casing d as indicated by the arrows w. In this oper ation, the air passes around the exible valve g5 inwardly through the ports or passages g8 and down through the central port or passage It in the bottom portion of the plunger head and out around the nut; z'* through the radial or lateral ports. or passages h. In this operation, as will be understood, air is compressed in the annular chamber f by means of the valve h* on the bottom part of the plunger head, and this air passes out through the nozzle m. In the downward movement of the plunger, the air in the bottom part of the tubular casing rl pass up into the annular chamber f as indicated by the arrows y, and this air under pressure also passes out through the nozzle m, and in this way air under pressure passes out. through` the nozzle m at both the upward and downward movements of the plunger. n

1t will be observed that the skirt, valve g5 around the top part of the plunger head has no movementl in the tube e but. remains in the same position at all times, but yields to permit the air to pass around the bottom tbereot'in the operation described.

ihe separate parts of the top portion g of the plunger head are provided in their adjacent t'aees with annular grooves n, and the sopa rate parts of the bottom portion lL of the plunger head are provided in their adjacent. faces with annular grooves 12,2, and when the said parts are bound togetherathe packing disks plat-ed tlu-rebet\veen expand in these grooves anti this tnalt't's an air tight ecnnt-ttion between said parts.

Ay improved pump is exeeetlingly simple in construction and opt-ration. and there are no sere threads used in t-onneetion with the tube, f or casior rl, and by simply takin;r olf the top plate or member l; all the main parts ol' the devil-e ma)r be detached or tli:-:ttutnet'tA ed at ouee for cleaning and other purposes. and by taking otl' the nut i" the .st-parate parts oll the plunger head may be disconn 91' neete l at once for cleaning or other purposes-l- The bottom plate or member l of the head propt-r is made wider in order that thtopel'- ator may place his feet thereon so as to firmly hold the pump in the operation thereof.

My invention is not limited to the exact details of construction herein shown and described, and various changes therein and modifications thereof may be made, within ower end with 'a head and at its upper end with a handle, said head and handle being connected by a rod passing therethrough and through said tube, said tube forming in lconnection with said easing an annular chamber provided at its u per end with a dlscharge nozzle, and said -end being coniposed of separate top and bottom portions,

Yso

the top portion being fitted coneentrically in said tube and the bottom portiorrbeing fitted eoncentrieally in said casing, the top portion being less in transverse dimensions than said tube and being provided with a flexible valve and the bottom portion being less in transverse dimensionsthan said easing and beingr provided with a tiexible valve, and the`parts of said head being also provided with ports or passages which communicate with the bottom portion of said, easing.

2. n an air pump or compressor, the combination of top and bottom plates or members connected by vertically arranged rods.,'said to and bottom plates er members being provi ed in their adaeent faces with chambers in which aiel placed packings, and n tubular casing the ends of which fit in said chambers and bear on said packings, and a plunger device passing downwardly through thel top V plate or member into said tubular easing,

and comprising a tube having air inlets at the top and a plunger head at the bottom,

a rod passing downwardly through said tube and through the plunger head and provided at its upper end with a handle and by means of which the separate parts of the plunger head are connected, said plunger head consisting of top and bottom parts, one of which is concentric in the lower end of said tube and provided with Aii downwardly directed skirt valve which fits the walls thereof, and the other of which is fitted to the lower end of said tubo and is provided with a skirt valve directed upwardly and which lits the inner walls of said tubular casin'g, said plunger head or the separate parts thereof boing provided with ports or passages whereby when the plunger device )noves up wardly air will pass downwardly around t e top portion of the plunger head and through ports or passages in the bottom part thereof plunger head into a chamber in the lower end of said tubular casing and up around the bottom portion of the plunger head into the annular chamber, and when said plunger device Vmoves downwardly thc airein the bottoni ofthe tubular casing will pass upwardly around the bottom portion of the plunger head into said' annular chamber.

3. In an air pump, a tubular casing, a. plunger movable therein and through the top portion thereof and comprising a. tube provided rat its lower end with a plun'fer head and at its upper end with a han( le, said tube forming in connection with said casing an annular chamber, and the handle and plunger head being connected by a rod passingl vertically therethrough and through said tube, and Lsaid tube being also previded at its upper end with air inlets, and the' composed of separate top and bottom parts,

and the top part being provided with a downwardly directed skirt valve which tits in said tube, and the bottom part with an upwardly directed skirt valve which lits in said casing, and said top and bottom arts of said plunger head being also provi ed with. air

-ports or passages and being bound together by nuts on said rod.

4. The combination 'in an air pump of a tubular casing and a plunger passing vertically through and movable in the top portion thereof, said plunger comprisin a tube provided at its lower end with a hea and at its u -per end with a handle, said head and hand e being held together b a rod passing vertically therethrough an through sai tube, said tube forming in connection with said casing an annular chamber provided near its upper end with a dischar e nozzle, and said head being composed o separate top and bottom portions held together by nuts on said rod, the top portion fitting concentrieally in said tube ,and the bottom portion tting concentrically in said tubular easing, the top portion being rovided with a dependin skirt valve, an said bottom 'portion wit an upwardly directed skirt valve, and the parts of the plunger head be` ing also provided with orts or passages which communicate with t. ie bottom portion of said tubular casing. D

In testimony that I claim the foregoing as my invention I have signed my name in presence' of the subscribing witnesses this 21st day of May 1909.

DAVID F. CORNELL Witnesses:

Gao. W. Gamesa, J. M. Hausen. 

